Thermostatic circuit closer



w. T. BRIDGES THERMOSTATIC CIRCUIT CLOSER Fi 1 ed May a, 1925 flfilliamTBrlly Jan. 6. 1 925..

INVENTOR E y z AhoRNEY Fatented den. 6, 1925.

WILLIAM TONIE BBEDGES, OF LA FAYETTE, GEORGIA.

THERMOSTATIC Application filed May 8 To (1Z6 1072 0221, it may concern Be it known that I, WILLIAM; T. Burners, a citizen of the United States, residing at La Fayette, in the county of lValker and State of Georgia, have invented new and useful Improvements in 'lhermostatic Circuit Closers, ot' which the following is a specification.

This invention relates to a thermostatic circuit closer, which is adapted to be used in connection with a fire alarm system for buildings, and which is operable upon the occurrence of fire conditions to close an electric circuit and sound the alarm.

One of the objects of the invention is to provide improved means for closing the electrical circuit upon the destruction of an element, which, when subjected to a temperature which would endanger the building, is either fused or burned so as to release the mechanism through the alarm.

With the above and other objects in view, which will be apparent from the following description, the invention consists of de tails 0i: construction which will be described in connection with the accompanying drawingsvand subsequently claimed.

In the drawings Figure 1 is a perspective view of the invention.

Figure 2 is a vertical sectional view thereof.

Figure 3 is a bottom plan view thereof.

Figure l is a sectional view on the line t4t of Figure 2.

Each of the circuit closers includes a cup-shaped housing 18, having aflat rim portion secured to a fiat surface 19 of the building by means of suitable screws 20 or the like, and held spaced therefrom by a peripheral flange provided with notches through which the wires pass. A plate 21 is secured transversely of the wires by-means of the same screws 20 which secure the lions i ng, and has a raised central portion to which an insulating block 22 is secured. The parallel' portions of the wires pass beneath the block 152, and are secured thereto by means of binding posts 23. The ends 24 of the binding osts constitute spaced contact members by t e bridging of which a circuit is established.

The under side of the housing 1.8 is formed with a central perforation 25 around which the housing turned inwardly to which completes the circuit CIRCUIT CLOSER.

1923. Serial No. 637,527.

form a flange 26. A movable contact member 27 is formed from sheet metal and dished to provide an outwardlyextending boss 28 adapted to extend through the perforation 25 and to be secured therein by a retaining pin 29, the inner portion of the member 27 being provided with a peripheral flange 30, which, when the member 27 is released from the pin 29, is adapted to contact with the spaced contact members 24 and bridge the same. An expansile coiled spring 31 is seat ed within the housing surrounding the flange 26 and presses against the flange 30, urging the contact member 27 toward the spaced contacts 24. The pin 29 may be made o't celluloid, lead or any other material which will be fused or burned when subjected triire. Consequently, as will be readily understood, when fire occurs, the pin 2.) will be destroyed, thus releasing the movable contact member 27, which, under the action of the spring 31, will be urged into position to bridge the spaced contacts 24 and establish a circuit.

t will be. understood that the specific means by which the invention is carried out and the specific arrangement herein described is merely illustrative, and that various modifications may be made therein without departing from the essential principles oi the invention, or sacrificing any of the advantages thereof.

lVhat is claimed is 1. In a thermostatic circuit closer, the combination of a cup-shaped housing having a rim with a flat portion secured to a sur face of the building, said rim having a peripheral flange engaging said. surface to hold the flat portion in spaced relation'thereto and provided with pairs of opposed notches, main lead wires having portions: traversing the housing and passing through said notches, a plate supported within the housing transversely of the wires and haring a raised portion underneath which the Wires pass and having insulating binding posts extending therethrough to which the wires are secured, said housing having a cont 'al perforation, a movable contact normally seated in said perforation and out of engagement with said binding posts, means holding the movable contact in this position but adapted to release the same upon the application of a predetermined degree of heat, and a spring seated in the housing and operable upon the release of said movthrough said able cont-not to more the ozone in ment with said. binding posts.

2 in a thermostatic circuit closer circniiz when the retaining pin is r In thermostatic circuit closer, 2L houscoinbinntion of cup-slmpcd honshw i i secured to a, fixed support and cont ing s run with a fiat POlllOIl secured to 111g spaced contact members, ninin lend Wires leving their terininoi portions connected X -3l. said spaced contacts, said housing hov- *eri orehion benea h. said contacts, with iii fienge Sill 'ling aid perfonl e Contact member of sheet form n bos which norirough rue perioration and 1 peripheral flange seated Qrnal things and extending surface of the building, snid riin lowing n. peripheral flange engaging said surface to hold the ihit portion in spaced relation lh etc and provided W'Q pairs of op; ised notches, innin lend \YllQS having parallel p n";i ns traversing the housing and mssinn' notches, a plate located \Yllllin the housing transversely of the Wli'cS end hnvinn reised )ortion underneath which A r 1 i 1 I r the W111) pass, and having insole. lg bnius 23 0116. [he some, a Insible pin retaining C ing oos'ts lo Wl .'ch the wires are securmi, said c the boss in normal position but adapted to bin ing posts extending through the plate to be fused when subjected to lire conditions,

form spaced contacts on the opgosite side and an expzznsile coiled spring surrouiuling thereof, said plate being secured to said said internal i'hinge and pressing ngnlnst said peripheral flange, said spring being operable when the pin has fused to force the movable contact member into position to bridge the spaced contact members to co1nplete the circuit through the lend wires.

in UZStllflOl'ly that claim the foregoing as any own, have heretonflixcd my signature surfnco by the some means Which secures the housing, said housing having a central per forntion, a movable contact member hn vii a boss nornmlly extending through the P81- 'liorntion a pin retaining; the boss in normni position but adapted to be destroyed when subjected to lire conditions. and means for forcing; the movable member into con'tnot with the spaced contact members to coin- 

